本文探讨了柑橘残留物作为包装膜生产的不同果胶材料的来源:水溶性橙渣提取物(WSE)(〜5%果胶),在柠檬酸(SP)中提取的半纯果胶(〜50%果胶),和商业纯柑橘果胶(CP)。首先,这些材料在化学组成方面进行了表征。然后,使用它们纯的或通过溶剂流延与壳聚糖或甘油混合来生产膜。最后,抗氧化活性,功能特性(例如,机械和气体阻隔性能),并评估膜的视觉外观。WSE膜表现出最高的抗氧化活性,但机械强度最低,断裂伸长率(EB)最高(54%);掺入壳聚糖增加了膜的强度(杨氏模量高35.5倍)。SP薄膜表现出中等的机械性能,通过添加壳聚糖增强(杨氏模量高4.7倍);它们表现出优异的干O2屏障。CP薄膜表现出与SP薄膜相似的O2阻隔,并具有最高的杨氏模量(〜29MPa)。但是它们的脆性需要甘油来改善柔韧性,和壳聚糖的添加损害了它们的表面规则性。总的来说,果胶材料的类型决定了薄膜的性能,较少精制的果胶提供与纯商业果胶一样多的好处。
This article explores the use of citrus residues as a source of different pectic materials for packaging film production: a water-soluble orange residue extract (WSE) (~5% pectin), semi-pure pectins extracted in citric acid (SP) (~50% pectin), and commercial pure citrus pectins (CP). First, these materials were characterized in terms of chemical composition. Then,
films were produced using them pure or mixed with chitosan or glycerol through solvent-casting. Finally, antioxidant activity, functional properties (e.g., mechanical and gas barrier properties), and visual appearance of the
films were assessed. WSE
films showed the highest antioxidant activity but the lowest mechanical strength with the highest elongation at break (EB) (54%); incorporating chitosan increased the films\' strength (Young\'s modulus 35.5 times higher). SP
films showed intermediate mechanical properties, reinforced by chitosan addition (Young\'s modulus 4.7 times higher); they showed an outstanding dry O2 barrier. CP
films showed a similar O2 barrier to SP
films and had the highest Young\'s modulus (~29 MPa), but their brittleness required glycerol for improved pliability, and chitosan addition compromised their surface regularity. Overall, the type of pectic material determined the film\'s properties, with less-refined pectins offering just as many benefits as pure commercial ones.